load on blades

[Electron Pump]

  When my genny is free spinning, which I only allow under supervision, The volt meter will run up as high as 16v. I hook it up to a 12v car headlight and of coarse the voltage and RPM fall rapidly showing me there is drag on the mill motor from the load.

  O.K. that leads me to my question. When a dc motor is hooked in line to a battery with a blocking diode, how much load is on the motor when it is on the way up to charge RPMs. When it hits charging voltage does the load change when the electrons actually begin moving into the batt?

[Electron Pump]

  Man, I sure thought I selected "Wind" diddnt intend to show up in newbies.

[ghurd]

It is a newbie question.

"how much load is on the motor when it is on the way up to charge RPMs"

Charge RPMs starts with Cut-In RPMs.

There is little load on the Blades before cut-in.  Iron losses, bearing grease, and brush friction may be the largest.

I expect you are asking about iron losses.

Simple answer: There is no load before cut-in.

"does the load change when the electrons actually begin moving"

Two ways to read that.

#1  Making electrons move takes power.  Power comes from somewhere.  Power comes from the blades, so the blades are more loaded.

#2  There is no load before cut-in.  There is a load after cut-in.

Either way, the load changes.

Have a look for stories related to cut-in and/or stall.

Better, longer, answers in that type of story.

G-

[Electron Pump]

  I think one thing that spawned the question is the talk of the little computer in the Air-x. It hits the battery with some juice and when the rpms drop it cuts the battery tie and allows the rpms to spin back up and then hits the batt again. Well that all sounds like what the isolator is going to do.

  Am I looking at things from the wrong angle?

[ghurd]

I am not an expert on the Air-X.

Sounds like you are confusing cut-in with that things internal regulator.

Or maybe mixing cut-in and that things internal regulator together.

No reason to do anything like the way you seem to understand it.

Maybe compare the blades to the gas pedal in the car?

You want to go 35MPH.  When the power needed and the gas flow balance, the car goes a steady 35MPH.

You would not floor it until 35.5MPH, then coast until 14.5MPH and floor it again. That would make no sense.  Not efficient and hard on the entire assembly.

Or you push the pedal part way down, and hold it there.

The speed changes as the road goes up and down hills.  Nothing violent. Smooth changes in speed.

This is about the treadmill motor windmill?

Connect it to a battery and an ammeter.

Watch the blades and amps.  You won't see any violent changes.

Easier to understand it after you see it.

A head light will only make things very confusing.

G-

[Electron Pump]

  Gotch-ya G, and once again thanks for taking the time to talk with me.

[ghurd]

I did not intend everything to sound as harsh as I read it now.

Important stuff:

- Do not use light bulbs.

Light bulbs on the output get people confused.  Light bulbs are quite complex under these conditions.

- Do not compare anything to an Air-X.

Air-X's get people confused, if they read long enough.

- No power moves into the battery until cut-in voltage is reached.

And no power moves into the battery until cut-in RPM is reached.

- Try it.  Try it Now.

Amps into a battery.  That's the big one.  And the most fun.

Pay attention to everything.  The nuance of the various situations is more important than anything else, because that is where understanding comes from.

Get fancy later.

[Electron Pump]

  G, I've got the tower up. I bought me two T-105's. All the connectors and cable. I believe I have everything I need except my pannel mount amp meter. I ordered a 15a analog type meter off e-bay that should have been here last week.

  As soon as I get that meter I will make all the connections in the power box. I have been afraid to hook it all in line till I had the meter to see whats happening. We have a week of predicted wind and I sure wish I had that meter.

  For now I have been using the head light I was talking about to hold the wind mill down. The mill itself doesnt have the 260v motor on it, its got a 130v@7099 right now so there is a spinny thing up there to look at. My tower tilts over easily so as soon as I can get that meter I will get to see what pumping electrons is really like.